it'd fit with some work,but it's a pointless conversion. noone in their right mind pulls out a 2l turbo 4cyl all alloy engine and replaces it with a 2l turbo 6cyl cast iron and alloy engine. there's nothing to gain,and a lot to lose.
an RB series engine is a virtual drop in to a silvia,you require a skyline engine cross member,gearbox,radiator and tailshaft. you also then need thermofans,to jack up the bonnet to clear the intake if it's not altered,and besides the obvious detriment to the handling,you'll likely have overheating issues. a 1G will have all of the same problems,with the added hassle of nothing being bolt in,so you'll have to fabricate everything.
Justin...
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